iFi iPower X Low Noise 9V DC Power Supply Adapter - Ultra Quiet for HiFi Audio, Home Theater, Gaming & Electronics - Perfect for DACs, Amplifiers, Turntables & Streaming Devices

This power supply does perform as intended. You should keep in mind that how effective this will be depends largely on what gear you intend to use it with. If you have a system that is resolving enough, you will notice an improvement. It doesn't add audio quality but instead cleans up the supplied power to allow device to perform optimally. I decided to try this with the Massdrop Arist R-1R DAC. I felt that this fairly affordable mutibit dac had potential but something was missing. In order to manufacture it within the price pint, some sacrifices had to be made. Usually one of the most expensive parts of high end gear is in the power supply. Arist compromised in this area by using a switching power supply. Granted, this results in a introductory price point for this dac but I am not aware of any high end multibit dac that takes this approach. This iFi power supply is a definite upgrade to the supplied switching power supply provided with the Arist. Using the Beyerdynamic DT1990 I can certainly hear a difference. Warmer midrange, more space and depth. It actually comes closer to the Schiit Bifrost. It does have a slightly more diffuse sound field than the Bifrost. I have been fooled a couple of times where I removed my headphones to make sure the loudspeakers were not on. The alternative would be to upgrade this dac by spending over $800 at a minimum. That makes this a good buy. I wish iFi made one for 24v demands. I'd replace the power supply to my Cavali Tube Hybrid and LCX+SDAC. When I switch back and fourth between the Arist and SDAC, the SDAC while very clean has a definite wall of sound compared to the large, spacious sounding ARIST. The iFi power supply really makes this immediately obvious where before you could tell it was there but not as apparent. A recommend buy for this setup.